My father passed away, leaving his property to his sister, my aunt. She promised to share a portion of the property with my mother. However, she sold the property and never gave my mother her promised share. Is there anything I can do about this situation?

You can file a civil suit against your aunt for breach of promise and seek a share of the property proceeds. The court may consider the promise made to your mother and the sale of the property, along with any available evidence, to determine a fair outcome.